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Full text of "Circuits"

555 Timer Blinky 



Makej Projects 



555 Timer Blinky 

Written By: Brian Jepson 



PARTS: 

Getting Started with Soldering Kit (1) 



SUMMARY 

In this project, you'll learn how to solder together a battery-powered, 555 Timer-driven blinky 
toy. 



Step 1 — 555 Timer Blinky 




• Check the kit to make sure you 
have two LEDs, the 555 timer, a 
capacitor, the four resistors shown, 
and a battery box. You'll need to 
supply a small amount of hookup 
wire. 



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555 Timer Blinky 



Step 2 




Doooa 
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Doooa 
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Doooa 
Doooa 
Doooa 
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Doooa 
ooooa 
Doooa 
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Doooa 
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ooooa 
ooooa 
ooooa 



• Place the protoboard in the helping 
hands in the orientation shown 
here. 

• To solder each component, you'll 
keep the board in the helping hands 
and roll it over, away from you so 
that it's reversed and upside down. 
• In this guide, we'll show the top 

view of the board on the left and 
the reversed view of the board 
on the right. 

• Place the 555 timer into the 
protoboard as shown, paying 
attention to the notch in the 555 
timer (it should be pointing up). 

• Flip the board over and solder the 
pads shown on the right-hand side 
of the image. 



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555 Timer Blinky 



Step 3 




• Place the 1 megohm resistor 
(Brown, Black, Green) into the 
board as shown. 

• The orientation of the 
resistor doesn't matter. 

♦ Flip the board over and solder the 
resistor into place. Trim the leads 
when you're done. 



Step 4 




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1 Place the second 1 megohm 
resistor into the board. 

■ Flip the board over, solder the 
resistor in place, and trim the 
leads. 



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555 Timer Blinky 



Step 5 




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• Insert the capacitor into the board 
as shown. 

• Like the resistors, the 
orientation of this kind of 
capacitor doesn't matter. 

• Solder the capacitor into place and 
trim the leads. 



Step 6 




• Prepare a short length of red 
hookup wire. This wire will be 
hooked up to the positive side of 
the battery and provide power to 
the chip. 

• Cut it so it's a little longer than 
the length shown. 

• Strip the ends to about 1/2 an 
inch. 

• Tin the ends of the wire. 

• Insert the wire into the board as 
shown, flip it over, and solder it into 
place. If you have any excess, trim 



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555 Timer Blinky 



Step 7 




• Prepare a length of green wire (or 
blue or yellow) as shown. 

• Insert it into the board as shown. 

• Solder it into place and trim any 



Step 8 




DOOO 
DOOO 
DOOO 



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• Insert a 100 ohm resistor as 
shown. 

• Solder it into place and trim the 
leads. 



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555 Timer Blinky 



Step 9 



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Q(ECOOO<K) 


ooooddO 




oooojodD 


Qok>ooood 






oooobE 


DODDOOOCB 


000(MM>B 


Bm>ooA(B 




DOOO 
DOOO 
DOOO 



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• Insert the second 100 ohm resistor 
as shown. 

• Solder the resistor into place and 
trim the leads. 



Step 10 



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A 



• Insert the LED as shown. 
• You must orient the LED 

as shown. The long 
(positive) lead needs to be on 
the side marked with the + 
symbol and the short (negative) 
lead on the side with the - 
symbol. 

• Solder it into place and trim the 
leads. 



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555 Timer Blinky 



Step 11 




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A 



• Place the second LED into the 
board. 
• The long (positive) lead 

needs to be on the side 
marked with the + symbol and 
the short (negative) lead on the 
side with the - symbol. 

• Solder it in place and trim the 
leads. 



Step 12 





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• Prepare another length of red 
jumper wire. 

• Place it in the PCB as shown. 

• Solder it into place and trim any 
excess. 



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555 Timer Blinky 



Step 13 




Doooa 

• 
Doooa 
Doooa 



Doooa 
Doooa 
Doooa 
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Doooa 



DOOOd) 
DOOO<B 
DOOOd) 
DOOOOD 
DOOOOD 



DOOO<M> 
DOOOd) 
DOOO<M> 
DOOO<M> 

dooox 

DOOOOD 
DOOO<K> 



A 



• Connect the battery box and blue 
wire as shown. 

• Remove the batteries 
before you solder it into 
place. 

• Solder the battery box and blue 
wire into place and trim away any 
excess wire. 



Step 14 




• Connect the battery and watch it 
blink! 

• The LEDs blink in an 
alternating fashion because 
one is connected "backwards". 
When the 555 timer's output pin 
goes "low", electricity flows through 
that LED. The other LED is 
connected normally. 



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